So much of what we do on our smartphone is driven by services, as companies provide us with access to things like cloud storage, social-media publishing, and instant messaging. And while many of us default to accessing these services through their official apps, plenty of third-party alternatives exist. Some of the companies behind these services are more tolerant of those alternatives than others, and we've already seen WhatsApp take heavy-handed action against such software. Now a new round of legal threats is underway, and this time the targets don't seem to be doing anything particularly objectionable.

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